Bochum IT researchers (IMAGE) Ruhr-University Bochum Caption David Rupprecht (right) collaborated with Bedran Karakoc (left) who has developed the app as part of his Bachelor thesis. Credit RUB, Marquard Usage Restrictions This image may only be used for reporting about Ruhr-Universität Bochum in the context of the press release "Security gap allows eavesdropping on mobile phone calls", published in August 2020. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.